The myth that people will walk alongside you and charge your card £30 is something spread by those seeking to get you to buy RFID blocking wallets.
No harm buying one if you want, but some are silly money and are sold by spreading fear.
And as for wireless key fobs being scanned, I don't think that is what happens. Rather someone is boosting the signal so a key in your hallway is now able to unlock the car on your driveway. Once started the key is no longer needed, but later on it will be immobilised. I assume the car is either hacked to start when time isn't an issue, or the car is broken down for parts.
No harm buying one if you want, but some are silly money and are sold by spreading fear.
And as for wireless key fobs being scanned, I don't think that is what happens. Rather someone is boosting the signal so a key in your hallway is now able to unlock the car on your driveway. Once started the key is no longer needed, but later on it will be immobilised. I assume the car is either hacked to start when time isn't an issue, or the car is broken down for parts.